3661943 has 2 divisors, whose sum is σ = 3661944. Its totient is φ = 3661942.

The previous prime is 3661913. The next prime is 3661949. The reversal of 3661943 is 3491663.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3661943 - 2¹⁰ = 3660919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3661949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1830971 + 1830972.

It is an arithmetic number, because the mean of its divisors is an integer number (1830972).

Almost surely, 2^3661943 is an apocalyptic number.

3661943 is a deficient number, since it is larger than the sum of its proper divisors (1).

3661943 is an equidigital number, since it uses as much as digits as its factorization.

3661943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 32.

The square root of 3661943 is about 1913.6203907776. The cubic root of 3661943 is about 154.1359203680.

The spelling of 3661943 in words is "three million, six hundred sixty-one thousand, nine hundred forty-three".